# PS2_Sp10 - CEE 320 Environmental Engineering Assignment#2...

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CEE 320 Assignment #2 Environmental Engineering complete by: W 3 February PROBLEMS: 1. Problem 4-4 in textbook, page 169 2. Paint emissions and indoor air quality Paint emits volatile organic compounds (VOCs) as it is drying. These compounds can be irritants to people with sensitive respiratory systems. Therefore, it is useful to consider the concentration of VOCs in the air of a freshly painted room. (a) What is the concentration of VOCs in the room at steady state? (b) Derive an equation for the VOC concentration (C) as a function of time. (c) What is the characteristic time for the VOC concentration to reach steady state? Data: V=100 m 3 Volume of the room Q=200 m 3 hr -1 Flow rate of air into and out of the room. E = 1.5 g hr -1 You may assume that the paint emission rate (E), is constant with time. C o = 0 At t = 0, the VOC concentration (C o ) is 0. 3. Unit conversion exercise and exposure pathways (a) In Appleton, Wisconsin, the median indoor airborne concentration of chloroform (CHCl 3 ) was found to be 0.4 μ g m -3 . Convert this concentration to a mole fraction in parts per billion

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